<template>
  <form-item-wrapper
    :designer="designer"
    :field="field"
    :rules="rules"
    :design-state="designState"
    :parent-widget="parentWidget"
    :parent-list="parentList"
    :index-of-parent-list="indexOfParentList"
    :sub-form-row-index="subFormRowIndex"
    :sub-form-col-index="subFormColIndex"
    :sub-form-row-id="subFormRowId"
  >
    <!-- el-upload增加:name="field.options.name"后，会导致又拍云上传失败！故删除之！！ -->
    <el-upload
      ref="fieldEditor"
      :disabled="field.options.disabled"
      :action="realUploadURL"
      :headers="uploadHeaders"
      :data="uploadData"
      :with-credentials="field.options.withCredentials"
      :multiple="field.options.multipleSelect"
      :file-list="fileList"
      :show-file-list="field.options.showFileList"
      list-type="picture-card"
      :class="{ hideUploadDiv: uploadBtnHidden }"
      :limit="field.options.limit"
      :on-exceed="handlePictureExceed"
      :before-upload="beforePictureUpload"
      :on-preview="handlePictureCardPreview"
      :on-success="handlePictureUpload"
      :on-error="handleUploadError"
    >
      <template #file="{ file }">
        <el-image ref="imageRef" style="width: 100%; height: 100%" :src="file.url" :preview-src-list="previewList" :initial-index="previewIndex" fit="cover" preview-teleported />
        <!-- 上传成功状态 -->
        <label class="el-upload-list__item-status-label">
          <i class="el-icon--upload-success" style="color: #fff"><svg-icon class="" icon-class="el-check" /></i>
        </label>
        <!-- 图片操作按钮 -->
        <span class="el-upload-list__item-actions">
          <!-- 预览 -->
          <span class="el-upload-list__item-preview" @click="handlePictureCardPreview(file)">
            <svg-icon icon-class="el-zoom-in" />
          </span>
          <!-- 删除 -->
          <span class="el-upload-list__item-delete" @click="handlePictureRemove(file)">
            <svg-icon icon-class="el-delete" />
          </span>
        </span>
      </template>
      <template #tip>
        <div class="el-upload__tip" v-if="!!field.options.uploadTip">{{ field.options.uploadTip }}</div>
      </template>
      <div class="uploader-icon"><svg-icon icon-class="el-plus" /></div>
    </el-upload>
  </form-item-wrapper>
</template>

<script>
import FormItemWrapper from "./form-item-wrapper";
import emitter from "@/components/FormDesigner/utils/emitter";
import i18n, { translate } from "@/components/FormDesigner/utils/i18n";
import { deepClone, evalFn } from "@/components/FormDesigner/utils/util";
import fieldMixin from "@/components/FormDesigner/form-widget/field-widget/fieldMixin";
import SvgIcon from "@/components/FormDesigner/svg-icon/index";

export default {
  name: "picture-upload-widget",
  componentName: "FieldWidget", //必须固定为FieldWidget，用于接收父级组件的broadcast事件
  mixins: [emitter, fieldMixin, i18n],
  props: {
    field: Object,
    parentWidget: Object,
    parentList: Array,
    indexOfParentList: Number,
    designer: Object,

    designState: {
      type: Boolean,
      default: false
    },

    subFormRowIndex: {
      /* 子表单组件行索引，从0开始计数 */ type: Number,
      default: -1
    },
    subFormColIndex: {
      /* 子表单组件列索引，从0开始计数 */ type: Number,
      default: -1
    },
    subFormRowId: {
      /* 子表单组件行Id，唯一id且不可变 */ type: String,
      default: ""
    }
  },
  components: {
    FormItemWrapper,
    SvgIcon
  },
  data() {
    return {
      oldFieldValue: null, //field组件change之前的值
      fieldModel: [],
      rules: [],

      uploadHeaders: {},
      uploadData: {
        key: "" //七牛云上传文件名
        //token: '',  //七牛云上传token

        //policy: '',  //又拍云上传policy
        //authorization: '',  //又拍云上传签名
      },
      fileList: [], //上传文件列表
      fileListBeforeRemove: [], //删除前的文件列表
      uploadBtnHidden: false,

      previewIndex: 1 // 初始预览图像索引
    };
  },
  computed: {
    previewList() {
      return this.fileList.map((el) => el.url);
    },

    realUploadURL() {
      let uploadURL = this.field.options.uploadURL;
      if (!!uploadURL && (uploadURL.indexOf("DSV.") > -1 || uploadURL.indexOf("DSV[") > -1)) {
        let DSV = this.getGlobalDsv();
        console.log("test DSV: ", DSV); //防止DSV被打包工具优化！！！
        return evalFn(this.field.options.uploadURL, DSV);
      }

      return this.field.options.uploadURL;
    }
  },
  beforeCreate() {
    /* 这里不能访问方法和属性！！ */
  },

  created() {
    /* 注意：子组件mounted在父组件created之后、父组件mounted之前触发，故子组件mounted需要用到的prop
         需要在父组件created中初始化！！ */
    this.initFieldModel();
    this.registerToRefList();
    this.initEventHandler();
    this.buildFieldRules();

    this.handleOnCreated();
  },

  mounted() {
    this.handleOnMounted();
  },

  beforeUnmount() {
    this.unregisterFromRefList();
  },

  methods: {
    handlePictureExceed() {
      let uploadLimit = this.field.options.limit;
      this.$message.warning(this.i18nt("render.hint.uploadExceed").replace("${uploadLimit}", uploadLimit));
    },

    beforePictureUpload(file) {
      let fileTypeCheckResult = false;
      if (!!this.field.options && !!this.field.options.fileTypes) {
        let uploadFileTypes = this.field.options.fileTypes;
        if (uploadFileTypes.length > 0) {
          fileTypeCheckResult = uploadFileTypes.some((ft) => {
            return file.type === "image/" + ft;
          });
        }
      }
      if (!fileTypeCheckResult) {
        this.$message.error(this.i18nt("render.hint.unsupportedFileType") + file.type);
        return false;
      }

      let fileSizeCheckResult = false;
      let uploadFileMaxSize = 5; //5MB
      if (!!this.field.options && !!this.field.options.fileMaxSize) {
        uploadFileMaxSize = this.field.options.fileMaxSize;
      }
      fileSizeCheckResult = file.size / 1024 / 1024 <= uploadFileMaxSize;
      if (!fileSizeCheckResult) {
        this.$message.error(this.$("render.hint.fileSizeExceed") + uploadFileMaxSize + "MB");
        return false;
      }

      this.uploadData.key = file.name;
      return this.handleOnBeforeUpload(file);
    },

    handleOnBeforeUpload(file) {
      if (this.field.options.onBeforeUpload) {
        let bfFunc = new Function("file", this.field.options.onBeforeUpload);
        let result = bfFunc.call(this, file);
        if (typeof result === "boolean") {
          return result;
        } else {
          return true;
        }
      }

      return true;
    },

    updateFieldModelAndEmitDataChangeForUpload(fileList, customResult, defaultResult) {
      if (!this.fieldModel) this.fieldModel = [];
      let oldValue = deepClone(this.fieldModel);
      if (!!customResult && !!customResult.name && !!customResult.url) {
        this.fieldModel.push({
          name: customResult.name,
          url: customResult.url
        });
      } else if (!!defaultResult && !!defaultResult.data.name && !!defaultResult.data.url) {
        this.fieldModel.push({
          name: defaultResult.data.name,
          url: import.meta.env.VITE_APP_API + defaultResult.data.url
        });
      } else {
        this.fieldModel = deepClone(fileList);
      }

      this.syncUpdateFormModel(this.fieldModel);
      this.emitFieldDataChange(this.fieldModel, oldValue);
    },

    handlePictureUpload(res, file, fileList) {
      if (file.status === "success") {
        let customResult = null;
        if (this.field.options.onUploadSuccess) {
          let customFn = new Function("result", "file", "fileList", this.field.options.onUploadSuccess);
          customResult = customFn.call(this, res, file, fileList);
        }

        this.updateFieldModelAndEmitDataChangeForUpload(fileList, customResult, res);
        this.fileList = deepClone(fileList);
        this.uploadBtnHidden = fileList.length >= this.field.options.limit;
      }
    },

    updateFieldModelAndEmitDataChangeForRemove(file) {
      console.log(`this.fieldModel1${this.fieldModel}1`);

      let oldValue = deepClone(this.fieldModel);
      let foundFileIdx = -1;
      this.fileListBeforeRemove.map((fi, idx) => {
        /* 跟element-ui不同，element-plus删除文件时this.fileList数组对应元素已被删除！！ */
        if (fi.name === file.name && (fi.url === file.url || (!!fi.uid && fi.uid === file.uid))) {
          /* 这个判断有问题？？ */
          foundFileIdx = idx;
        }
      });
      if (foundFileIdx > -1) {
        this.fieldModel.splice(foundFileIdx, 1);
      }

      this.syncUpdateFormModel(this.fieldModel);
      this.emitFieldDataChange(this.fieldModel, oldValue);
    },

    handleBeforeRemove(fileList) {
      /* 保留删除之前的文件列表！！ */
      this.fileListBeforeRemove = deepClone(fileList);
    },

    handlePictureRemove(file) {
      this.handleBeforeRemove(this.fileList); // 由于自定义了 #file slot，需要手动调用 handleBeforeRemove，并移除 @before-remove 和 @remove
      this.fileList.splice(this.fileList.indexOf(file), 1); // 删除所点击的文件
      this.updateFieldModelAndEmitDataChangeForRemove(file);
      let fileList = deepClone(this.fileList); // 进行深拷贝，避免用户自定义函数对 fileList 进行修改时，影响组件内的数据
      this.uploadBtnHidden = fileList.length >= this.field.options.limit;

      if (this.field.options.onFileRemove) {
        let customFn = new Function("file", "fileList", this.field.options.onFileRemove);
        customFn.call(this, file, fileList);
      }
    },

    handleUploadError(err, file, fileList) {
      if (this.field.options.onUploadError) {
        let customFn = new Function("error", "file", "fileList", this.field.options.onUploadError);
        customFn.call(this, err, file, fileList);
      } else {
        this.$message({
          message: this.i18nt("render.hint.uploadError") + err,
          duration: 3000,
          type: "error"
        });
      }
    },

    handlePictureCardPreview({ url }) {
      // 设置图片索引为当前点击的图片
      this.previewIndex = this.previewList.indexOf(url);
      // 模拟点击 <el-image> 组件下的 img 标签（点击事件被绑定在的每张 img 上）
      this.$refs["imageRef"].$el.children[0].click();
    }
  }
};
</script>

<style lang="scss" scoped>
@import "../../styles/global.scss"; /* form-item-wrapper已引入，还需要重复引入吗？ */

.full-width-input {
  width: 100% !important;
}

.hideUploadDiv {
  :deep(div.el-upload--picture-card) {
    /* 隐藏最后的图片上传按钮 */
    display: none;
  }

  :deep(div.el-upload--text) {
    /* 隐藏最后的文件上传按钮 */
    display: none;
  }

  :deep(div.el-upload__tip) {
    /* 隐藏最后的文件上传按钮提示 */
    display: none;
  }
}

.uploader-icon {
  height: 100%;
  display: flex;
  color: #8c939d;
  font-size: 28px;
  justify-content: center;
  align-items: center;
}
</style>
